Crest Audio HPW - Manual (Page 32)

p. 32
HPW TM owner’s manual
groups 6
group connectors- rear panel
The HPW group output connections are located on the Master rear output panel. Each
group features a 1/4” TRS output connector, along with a 1/4” TRS Insert connector. The
output is a ground-compensated, impedance-balanced TRS jack. For wiring purposes,
treat this connector exactly like a balanced output. When connected to an unbalanced
input, the ground-compensation circuitry will act to reduce the ground-signal differences
between the console and the remote gear.
The TRS Insert jack is wired as Tip=Send, Ring=Return, Sleeve= Audio Ground. This is
the “industry-standard” wiring scheme for most single-jack inserts. The Insert send-point
is located directly after the group mix amp, the Insert return feeds the top of the group
fader, or the top of the level pot if Fader-Reverse is active (see Block Diagram).
group output 1/4" TRS jack
The group output signal is available at this output jack. The output jack is impedance-
balanced, ground-compensated.
Tip is +Drive, Ring is -Drive Return, Sleeve is Chassis Ground
Send (Drive) impedance is 50Ω
Ring impedance is 50Ω to Audio Ground
Nominal Operating Level= +4dBu
Max Output Level= +21dBu (into 2kΩ or higher)
insert jack 1/4" TRS jack
This switching 1/4” TRS jack allows an external signal processor to be inserted into the
signal path of the group. The tip carries the SEND signal from the group, and the ring car-
ries the RETURN signal back to the group. The Insert-Send point is located directly after
the group mix amp, the Return comes back at the top of the group level control.
Tip is Send, Ring is Return, Sleeve is Audio Ground.
Send (output) impedance is 50Ω
Return (input) impedance is 5KΩ
Nominal Operating Level= -2dBu
NOTE: To avoid any degradation of the HPW’s group signal, any processing gear
patched into the group insert jack should have a low impedance output (<100Ω) and
must be capable of cleanly driving a 2KΩ load to +21dBu.
NOTE: The Fader-
Reverse switch does
not change the function
of any of the rear-panel
jacks. The Group Output
and Insert jacks are always
located here. Similarly, the
Aux Output and Insert jacks
always retain their same
function.
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